'Teen Mom' Stars Can't Hide Arrest Forever

Catelynn Lowell and Tyler Baltierra have projected a fairly squeaky clean image since choosing adoption for daughter Carly on 16 & Pregnant, but a blast from the past paints another picture of the Teen Mom stars. Turns out both of them have been arrested!

And here we thought these two bright young things were all about going to college and living on the straight and narrow -- in direct contrast to their law-breaking parents. Could they be more like jailbird co-star Amber Portwood than we knew?

Probably not.

The arrest that's got the whole world up in arms today, after being reported in the new Teen Mom Confidential book, was for marijuana possession, and it happened way back in July 2009. Catelynn and Tyler both admitted their guilt, and they got a whopping fine of $253 each.

Listen, I'm not going to say using illegal substances is advisable. I don't want MY kid using them when she's a teenager (or now for that matter). But we're talking about pot here, and not a whole heck of a lot of it when you consider the fine. The Teen Mom stars weren't running some huge grow operation here.

They were caught with a little weed.

Yeah, them and how many kids in America?

Not to mention the arrest happened in 2009 ... and here we are in 2013 with no further proof that this duo has done anything wrong. It hardly sounds like Catelynn and Tyler are "bad" kids, just normal American teenagers ... which is what choosing adoption really allowed them to be.

If anything, the real shocker here is that they managed to hide this arrest for this long in a world that's obsessed with Teen Mom gossip. I guess this just goes to show nothing stays hidden forever.